TOHATSU BFT250A Service Manual page 162

dummyhead dummyhead
FUEL SYSTEM
DTC 140-1, 140-2 (ECT SENSOR 2 (EMT SENSOR 1) VOLTAGE IS TOO LOW
OR TOO HIGH)
ECM
5 V
TOH1
SG2
DTC 140-1 (ECT SENSOR 2 (EMT SENSOR 1)
VOLTAGE IS TOO LOW)
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the EMT sensor 1 2P connector
ECM connector A
joint connector 1
Clear the DTC (page 5-6).
• Continue the procedure if the DTC does not
clear.
Turn the combination switch ON.
Measure the EMT sensor 1 voltage using the HDS.
Is the measurement within 0.08 – 4.92 V?
YES
NO
2. EMT sensor 1 signal line short circuit inspection
Turn the combination switch OFF and disconnect
the EMT sensor 1 2P connector
Turn the combination switch ON.
Measure the voltage between the EMT sensor 1 2P
connector
Black) terminal and engine ground.
Is the measurement within 4.75 – 5.25 V?
YES
NO
5-40
R/Bl
G
, ECM connector B
and then reconnect them.
– Temporary failure (code
reappear).
– GO TO STEP 2.
main wire harness side No.1 (Red/
– Replace the EMT sensor 1 with a new one
and recheck.
– Repair short in the main wire harness
between the ECM and EMT sensor 1. If
the main wire is correct, replace the ECM
with a new one and recheck.
3
9
JOINT CONNECTOR 1
,
,
does not
.
EMT SENSOR 1 2P CONNECTOR
MAIN WIRE HARNESS SIDE
ECT SENSOR
(EMT SENSOR 1)
R/Bl
G
Bl: Black Br: Brown
Y: Yellow O: Orange
Bu: Blue Lb: Light blue
G: Green Lg: Light green
R: Red P: Pink
W: White Gr: Gray
TOH1
(Red/Black)